I wrote a small macro (based on an old Smalltalk example) of recursively
placing CSG pieces in a 2D curve. I sent it on its merry way with an order-9
dragon, scaled it along the z-axis (for me, Z is always UP, using the
RIGHT-hand rule, and I can't understand you left-handed y-uppers), and then
intersected it with a hightfield. This was the scary part, because I wasn't
sure if that would work. You end up with a chopped-off hunk of road, which
you can then raise slightly off the landscape.

No trick texturing. In fact, I was disappointed that I couldn't make the
whole median dashed, like on the crossroads. I couldn't figure out what
patterns to use.

Source available, if you really want it. It's messy (first SERIOUS PoV
project).

-Eli

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